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So, I spoke to my materials scientist friend. Too many unkowns for you to have a straight answer. If the wheels were simply forged and not heat treated afterwards in any way, which he thinks is most likely the case, by curing them at 400 degrees F for "long enough" you might indeed weaken them as the the beneficial effects of strain hardening that occurs during the forging process might be reversed. That was going to be my initial response based on the introductory materials science class I took 15 years ago, but here we have it confirmed by an expert. Regardless, a specific answer cannot be reached without knowing if the wheels were heat treated after being forged and how long they will be cured for during powder coating at 400 degrees F.
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